I am 100% Anti-religious. Don't get me wrong though, most of the people I know are religious, and you can believe in what you want, that is a right, but don't try to shove it onto tables in science classrooms claiming it as fact, when there is so much scientific evidence proving otherwise.

As a religious person, I whole-heartedly agree with you on the creationist issue. I don't understand Creationists all that much when it comes to their conviction it should be taught in the classroom of science. It's not a science. It cannot be falsified. Hell, even theologically it poses significant problems. There are two conflicting creation stories. How do they explain that? The only way I see it is that it is allegorical, which totally goes against all that they (Creationists) stand for. Long before Darwin, Origen, an early church father, seventeen centuries ago expressed severe and strong doubts that the creation story in Genesis could possibly be literally true. So it absolutely boggles my mind that now that science has long confirmed Creationism to be adamantly false, people still claim it to be true.

Separation of Church and State
Abortion
Immigration
Military Funding
Universal Healthcare
Gun rights
And most recently, Net Neutraility

There's an easy answer for all of these really (except Immigration)

Most controversial person.... probably Hitler. According to cognitive dissonance, Hitler may have truly thought he was doing right. I don't hate him for it. I don't support it either, but the German people did recover their sense of nationalism, pride, and experienced a boom an economic prosperity (considering they lost millions of Jewish competitors). So in a sense, he did good for them, bad for the world. It's all opinions really.

I think it mostly depends on the group involved. I think abortion is the one that is hardest to have a sane debate about. It's the only thing I wouldn't bother to bring up. There is no wide consensus for one side of the issue or the other, and I think a large number of people feel uncomfortable picking a side for just themselves.

Most other widely debated issues are more weighted in terms of general opinion one way or the other. There is also seemingly less emotional baggage associated with picking a side. And compromise is possible with issues like Immigration and Gun rights, so that helps.